Add sticker sending, fix sticker rendering, and integrate Find My Friends#188

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Commits on Mar 16, 2026

Integrate Find My Friends for location fetching in iOS chat view
MrMistic
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Fix sticker rendering: add HEIC conversion, error handling, and stickerback attachment loading

MrMistic
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MrMistic
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Add sticker sending support (folder, save-as-sticker, picker, send path)

MrMistic
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MrMistic
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